JPS6130475A - Frame for motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a frame for a motorcycle that is reinforced around a head pipe.

[Technical background of the invention and its problems]

The mainstream of motorcycle frames is that each part of a metal tube or channel member is molded into a desired shape and assembled by connecting these molded parts, and welding is mainly used for this connection.

In motorcycles made of metal tubes, the tank rail and down tube are fixed to a connecting member around the head pipe, and the engine is mounted in the space surrounded by the tank rail, down tube, and body tube.

The head pipe supports the front wheel by a front fork via a steering shaft, and the rear wheel is supported by a swing arm attached to the lower rear of the down tube and body tube.

For this reason, in motorcycles, stress tends to concentrate around the head pipe and the lower part of the body tube. In particular, tank rails and down dups gather around the head pipe, and the stress is severe because the cross-sectional area of the frame is small. In conventional motorcycles.

A reinforcing bridge is installed in the connecting member around the head pipe, where stress is concentrated, to reinforce this area.

Since the connecting member is reinforced by interposing the reinforcing bridge, it has sufficient strength against bending and flexural deformation. However, to withstand twisting of the vehicle body frame, a complicated reinforcing structure is required, which is not necessarily sufficient.

In addition, by passing a reinforcing bridge over the connecting member around the head pipe, the structure of this part becomes complicated, and several tubes become congested, requiring many welding points, making welding work difficult. In addition, localized stress occurs around the head pipe, where stress is concentrated, and the stress distribution is not uniform, making it difficult to uniformly attach reinforcing bridges, etc. However, the installation work is troublesome and takes a long time.

[Purpose of the invention]

The present invention has been made in consideration of the above-mentioned circumstances, and it is an object of the present invention to provide a frame for a motorcycle in which the structure around the head pipe, where stress is concentrated, is simplified and has high rigidity.

[Summary of the invention]

In order to achieve the above object, the motorcycle frame according to the present invention has a hollow connecting member having a rectangular cross section fixed around the head pipe, and a front end of a frame such as a panel frame is connected to this connecting member. The vehicle body frame is constituted by a reinforcing member, and a strength member is interposed within the connecting member.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a motorcycle frame according to the present invention will be described below with reference to the accompanying drawings.

1 and 2, reference numeral 10 indicates a body frame of a motorcycle, and this body frame 10 includes a connecting member 12 fixed in a V-shape around the head vibrator 1.
and a pair of left and right panel frames 13 which are integrally or integrally connected to the free end of the connecting member 12. The left and right panel frames 13 are reinforced with reinforcing bridges 14.

The head pipe 11 accommodates a steering shaft 16 connected to the steering wheel shirt 1-15, and a front flap 17 is connected to the steering shaft 16.
A front wheel 18 is rotatably supported at its lower end.

On the other hand, the panel frame 13 is installed so as to extend diagonally downward from the connecting member 12, and engine mounting brackets 20a are placed at appropriate intervals in the front and rear lower parts of the panel frame 13.
, 20Jb are installed, and both of these mounting brackets 2
An engine 21 is mounted in a space surrounded by 0a and 2Ob.

A swing arm 22 is supported in the middle of the rear mounting bracket 2'Ob in the form of a cantilever so as to be able to swing up and down, and a rear wheel 23 is held at the free end of this arm. The swing of the swing arm 22 is absorbed by the buffer unit 24, and vibrations of the rear wheels 23 during running are prevented from being directly transmitted to the vehicle body frame 10.

Further, a seat rail mounting bracket 25 is provided at the rear upper part of the panel frame 13 of the vehicle body frame 10, and the base of a seat rail 26 is fixed to this mounting bracket 25. The seat rail 26 extends rearward and obliquely upward from the mounting bracket 25, and a seat 27 is attached to the extended portion thereof.

In addition, the code|symbol 29 is a fuel tank.

By the way, the panel frame 13 has a honeycomb element 32 between the main frame plate 30 and the sub-frame plates 1 to 31 which are arranged in parallel at appropriate intervals.
are formed into a layered structure by interposing them, and by welding them together by resistance welding or the like, an integrated henicum sandwich structure is formed. At this time, in order to reduce the weight of the panel frame 13, the main frame plate 30, sub-frame plate 31, and honeycomb elements 32 are made of light metal or light alloy material such as aluminum.

On the other hand, the connecting members 12 welded around the head pipe 11 are provided in a pair of left and right sides in a V-shape. This connecting member 12 has a hollow shape with a rectangular cross section as shown in FIGS. 3 to 5, and a reinforcing plate 35 as a strength member is interposed therein. The reinforcing plate 35 is formed in a rectangular shape, and its upper and lower ends are integrally welded to the top and bottom of the hollow connecting member 12, and its front and rear ends are welded to diagonally opposite corners of the connecting member 12 to provide rigidity. It has a rigid structure that has sufficient strength against not only bending and flexural deformation, but also torsional deformation.

Various other methods of interposing the reinforcing plate 35 can be considered. The free end of the connecting member 12 is provided with a plurality of through holes 36 such as bolt holes.
The front end portions of the panel frames 13 are connected by tightening with tightening bolts or the like via the panel frames 6.

Therefore, in the motorcycle according to the 1996 invention, hollow connecting members 12 having a rectangular cross section are welded in pairs around the head pipe 11 where stress is concentrated, and strength is provided within the connecting members 12. Since the member 35 is interposed, the connecting member 12 has a reinforced and rigid structure, and has sufficient strength against not only bending and bending deformation but also torsional deformation.

In one embodiment of the present invention, a panel frame is connected to a connecting member welded around the head pipe, but instead of this panel frame, a pipe frame such as a tank rail or down tube may be integrated by welding. It may be installed on the

In the car frame, a honeycomb element is fixed between the main frame plate and the sub-frame plate to form a panel frame with a Hanino J Musandidge structure, and since this panel frame is applied to the car body frame, the shape of the panel frame can be changed. It can be easily designed to have a shape suitable for the vehicle body frame, and the strength of the vehicle body frame can be maintained sufficiently.

Further, by using a panel frame having a honeycomb lean switch structure for the vehicle body frame, welding work during assembly of the vehicle body frame can be significantly reduced, and the assembly work can be simplified and efficiency improved.

Furthermore, if the main frame plate, sub-frame plate, and honeycomb element of the panel frame are made of light metal such as aluminum or light alloy, the body frame can be made lighter and has sufficient strength despite its light weight. We can provide the body frame.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a motorcycle using the frame of the two-wheeled motor vehicle according to the present invention, Fig. 2 is a plan view of the frame of the motorcycle shown in Fig. 1, and Fig. 3 is a main part of the invention. FIG. 4 is a side view showing the panel frame, FIG. 4 is a partially cutaway view of the panel frame, and FIG. 5 is a plan view of FIG. 4. 10...Vehicle frame, 11...Head pipe, 1
2... Connecting member, 13... Panel frame, 17
...Front wheel, 18a, 18b, 27...Mounting bracket, 20...Engine, 23...Swing arm,
24... Rear wheel, 28... Seat rail, 31...
Main frame plate, 32...Sub frame plate, 33...Honeycomb niremen 1~.

Claims (1)

[Claims] A hollow connecting member having a rectangular cross section is fixed around the head pipe in a V-shape, and the front end of a frame such as a panel frame is connected to this connecting member to form a vehicle body frame. A motorcycle frame characterized by having a strength member interposed therein.